I find it dubious that Starfleet would risk the lives of 400-500 crew on a mission to the SMC via a wormhole that didn't have a high probability of getting them back, if they couldn't why send the mission out in the first place, they wouldn't get that information back? If a ship was sent out and then stranded, assuming they'd then have excellent conditions to return back to UFP space with conventional warp it would be what 130-150 years, so it'd be around 2431-2451 that the ship would return, by which time a new propulsion system could've cut that travel down to months and led to the SMC becoming a region that is commonly travelled by Starfleet and already explored to a greater level of detail than the ship sent out the previous century, which then makes the entire mission and all the lives of the crew who would've passed away just a waste.